Briefing
The open pit production target is estimated to be 18.3 million tonnes at an average grade of 3.4% lead and 39g/t silver. [Read the full DFS announcement here](https://boabmetals.com/wp-content/uploads/2023/05/Sorby-Hills-Definitive-Feasibility-Study.pdf). - **JUL 2022 – EPA Approval Received for Site Establishment and Early Works at Sorby Hills** Boab receives approval from the Western Australian Environment Protecti Key points: The open pit production target is estimated to be 18.3 million tonnes at an average grade of 3.4% lead and 39g/t silver. [Read the full DFS announcement here](https://boabmetals.com/wp-content/uploads/2023/05/Sorby-Hills; The PFS base case (“Whole Ore”) Production Target mines 14.7Mt (circa 92% Measured and Indicated, 8% Inferred) at an average grade of 3.6% Pb and 39 g/t Ag. [Read the full PFS announcement here](https://boabmetals.com/wp; The Key Highlights included: - Strong pre-tax economics including A$778M net cash flow, NPV8 of A$411M, IRR of 37% and an average annualised EBITDA of A$126M. - High confidence study with up to date tendered pricing. - C; The DFS demonstrated strong pre-tax economics including the A$705M net cash flow, NPV of A$370M, IRR of 35% and an average annualised EBITDA of A$119M; The agreement is a critical element of the path to market for the concentrates that will be produced at Sorby Hills and shipped to customers. [To find out more read here](https://boabmetals.com/wp-content/uploads/2023/01; The updated Mineral Resource Estimate represents a significant milestone in the development of the Sorby Hills Lead-Silver Project. [Read the full Mineral Resource Update here.](https://boabmetals.com/wp-content/uploads/. This brief is based on the cited source artifact and is intended as a research entry point, not a replacement for the original source or EGM canonical data tables.
Source Notes
The open pit production target is estimated to be 18.3 million tonnes at an average grade of 3.4% lead and 39g/t silver....
Extractive summary evidence · source
The PFS base case (“Whole Ore”) Production Target mines 14.7Mt (circa 92% Measured and Indicated, 8% Inferred) at an average grade of...
Extractive summary evidence 2 · source
The Key Highlights included: - Strong pre-tax economics including A$778M net cash flow, NPV8 of A$411M, IRR of 37% and an average...
Extractive summary evidence 3 · source
The DFS demonstrated strong pre-tax economics including the A$705M net cash flow, NPV of A$370M, IRR of 35% and an average annualised...
Extractive summary evidence 4 · source
Extracted Document Text
This is a readable excerpt of the EGM normalized Markdown text. It helps search engines and researchers understand PDF, filing, or company-document content while the original source remains authoritative.
# Sorby Hills Project | Base Metal & Precious Metal Mine Source: https://boabmetals.com/sorby-hills/ Fetched: 2026-09-12T08:04:05.338+00:00 Source artifact: 6a68b7d2-e8dc-4eb3-a4c5-3118dfd258e7 Normalizer input: text ## Content # Sorby Hills Project | Base Metal & Precious Metal Mine Source: https://boabmetals.com/sorby-hills/ [](https://boabmetals.com/) - [About](https://boabmetals.com/about/) - [Our Partners](https://boabmetals.com/our-partners/) - [Directors and Management](https://boabmetals.com/directors-and-management/) - [Corporate Directory](https://boabmetals.com/corporate-directory/) - [Corporate Governance](https://boabmetals.com/corporate-governance/) - [Supplying to Boab Metals](https://boabmetals.com/suppliers) - [Projects](https://boabmetals.com/sorby-hills/#) - [Sorby Hills](https://boabmetals.com/sorby-hills/) - [Manbarrum](https://boabmetals.com/manbarrum/) - [Eight Mile Creek](https://boabmetals.com/eight-mile-creek/) - [Non-Core Assets](https://boabmetals.com/non-core-assets/) - [Our Metals](https://boabmetals.com/sorby-hills/#) - [Lead](https://boabmetals.com/lead/) - [Silver](https://boabmetals.com/silver/) - [Offtake](https://boabmetals.com/offtake/) - [Investors](https://investors.boabmetals.com/) - [Sustainability](https://boabmetals.com/sustainability/) - [Community](https://boabmetals.com/community/) - [Environment](https://boabmetals.com/environment/) - [Health and Safety](https://boabmetals.com/health-and-safety/) - [Careers](https://boabmetals.com/careers/) - [News](https://boabmetals.com/blog/) - [Contact](https://boabmetals.com/contact/) - [ASX: BML\\ \\ SHARE PRICE\\ \\ ](https://boabmetals.com/sorby-hills/#) Select Page # Sorby Hills Project ## Sorby Hills Development Project Boab owns 100% of the Sorby Hills Silver-Lead Project. Sorby Hills is located 50km from the regional centre of Kununurra. There are existing sealed roads to transport concentrate from site to the facilities at Wyndham Port, a distance of 150km, and established infrastructure allows for fast track production. - [Major\\ \\ Milestones](https://boabmetals.com/sorby-hills/#) - [Geology](https://boabmetals.com/sorby-hills/#) - [Environmental\\ \\ Approvals](https://boabmetals.com/sorby-hills/#) - [Boab Exploration &\\ \\ Resource Delineation](https://boabmetals.com/sorby-hills/#) - [Drilling\\ \\ Highlights](https://boabmetals.com/sorby-hills/#) - [Resources and\\ \\ Reserves](https://boabmetals.com/sorby-hills/#) - [2024 Front End\\ \\ Engineering Study](https://boabmetals.com/sorby-hills/#) - [2023 Definitive\\ \\ Feasibility Study](https://boabmetals.com/sorby-hills/#) - [Metallurgical\\ \\ Testwork](https://boabmetals.com/sorby-hills/#)  - **MAY 2026 – EPC Contract Executed** Boab announced the execution of an EPC contract with GR Engineering Services for a scope of work comprising the disassembly, refurbishment and relocation of the existing DeGrussa Processing Plant to Sorby Hills, where it will be re-constructed and commissioned to suit Boab Metals’ requirements. [Read the full details of the announcement here](https://investors.boabmetals.com/announcements/7552569) - **MAY 2026 – DeGrussa Processing Plant Acquisition moves to completion** Boab Metals announced that all conditions precedent to completion of the Sale & Purchase Agreement with Sandfire Resources Limited to acquire the DeGrussa Processing Plant for use at Boab’s Sorby Hills Silver Lead Project have been satisfied. [Read the full details of the announcement here](https://investors.boabmetals.com/announcements/7541396) - **APR 2026 – Diesel supply secured** Boab announced that it had entered into a 6-year Diesel Supply Agreement with CGL Fuel Pty Ltd, a subsidiary of Cambridge Gulf Limited, to provide a secure, reliable and long-term fuel supply solution for Sorby Hills during construction, commissioning and operations. [Read the full details of the announcement here](https://investors.boabmetals.com/announcements/7499991) - **APR 2026 – Project financing completed** Boab announced that it has executeda full form Syndicated Facility Agreementarranged byMerricks Capital Pty Limited and Davidson Kempner Capital Management LP forA$236 millionequivalentof project financedebtfacilitiesto fundthe development of the Sorby Hills Silver–LeadProject. [Read the full details of the announcement here](https://investors.boabmetals.com/announcements/7508354) - **JUN 2024 – Sorby Hills Front-End Engineering & Design (FEED) Study Results** Following the Sorby Hills Definitive Feasibility Study (“DFS”) released by the Company in January 2023, Boab Metals undertook a Front-End Engineering & Design (FEED) Study. The results of the FEED Study identified clear opportunities to optimise and de-risk the Project both technically and economically and augment and enhance the DFS. Key Project updates included post FEED pricing for the Process Plant EPC Contract, updated mining schedule bringing forward mining at the high-grade Norton Deposit, updated metal recovery and concentrate grades for the Norton deposit, updated pricing for the Mining and Earthworks Contracts and updated tailings strategy with above-ground tailings disposal being employed for the Life of Mine as opposed to in-pit deposition previously adopted in the DFS. [Read the full FEED Study Results here](https://boabmetals.com/wp-content/uploads/2024/06/Sorby-Hills-FEED-Study-Results.pdf) - **MAY 2024 – Metallurgical Testwork Improves Metal Recovery and Concentrate Grades at the Norton Deposit** By incorporating the interim results of flotation variability tests from additional post DFS drill core samples the results delivered a 5% increase in Norton Deposit lead recovery from 78% to 83% and confirmed silver recovery at 78%, together with an improvement in concentrate grade from 56.9% Pb to 59.5%Pb. These results augment and enhance the Sorby Hills Definitive Feasibility Study (“DFS”) released by the Company in January 2023. The improved metallurgy results confirm the merit of a future reassessment of the Ore Reserve at Norton Deposit via rerunning pit optimisations and open pit design. [Read the full details of the announcement here](https://boabmetals.com/wp-content/uploads/2024/05/Testwork-Improves-Metal-Recovery-and-Concentrate-Grades.pdf) - **NOV 2023 – Significants Intercepts at Sorby Hills** Boab Metals reports assay results from the Phase VII drilling program at the Sorby Hills Lead-Silver-Zinc Project, including a material intercept from the 1st drill hole at the Keep Seismic Target. [Read the full announcement here](https://boabmetals.com/wp-content/uploads/2023/11/Significant-Intercepts-at-Sorby-Hills.pdf) - **AUG 2023 – Completion of Front End Engineering & Design (FEED)** Completion of Front-End Engineering and Design (“FEED”) resulted in a more detailed process plant design and optimised plant layout. GR Engineering (GRES) provided updated tendered pricing for the process plant based on the FEED outcomes and current raw material and labour costs. The refreshed pricing delivered a result that is consistent with the DFS pricing. - **JUL 2023 – Heads of Agreement for New Shire Accommodation Facility in Kununurra** Boab Metals announced the execution of a Heads of Agreement with the Shire of Wyndham and East Kimberley (“SWEK”) for the construction and long-term lease of a new accommodation facility within Kununurra, 50km from its 75% owned Sorby Hills Lead-Silver-Zinc Project. [See the full details of the agreement here](https://boabmetals.com/wp-content/uploads/2023/07/Heads-of-Agreement-for-New-Shire-Accommodation-Facility.pdf) - **MAR 2023 – Engineering & Design Commences for Sorby Hills Project** Boab Metals announces GR Engineering (GRES) has commenced Front End Engineering (FEED) for the process plant and associated infrastructure at the Company’s flagship Sorby Hills Lead-Silver-Zinc Project. [To find out more read here](https://boabmetals.com/wp-content/uploads/2023/05/Engineering-Design-Commences-for-Sorby-Hills-Project_13Mar2023.pdf) - **JAN 2023 – Definitive Feasibility Study (DFS)** Boab Metals reached a major milestone and delivered the Sorby Hills Definitive Feasibility Study (DFS) with encouraging results. The DFS demonstrated strong pre-tax economics including the A$705M net cash flow, NPV of A$370M, IRR of 35% and an average annualised EBITDA of A$119M. The open pit production target is estimated to be 18.3 million tonnes at an average grade of 3.4% lead and 39g/t silver. [Read the full DFS announcement here](https://boabmetals.com/wp-content/uploads/2023/05/Sorby-Hills-Definitive-Feasibility-Study.pdf). - **JUL 2022 – EPA Approval Received for Site Establishment and Early Works at Sorby Hills** Boab receives approval from the Western Australian Environment Protectional Agency (EPA) to commence site establishment and Early Works at the Sorby Hills Lead-Silver Project. [Read the full details of the announcement here](https://boabmetals.com/wp-content/uploads/2023/05/EPA-Amendment-Approval-Received-for-Sorby-Hills.pdf) - **APR 2022 – Heads of Agreement Executed with Horizon Power** A Heads of Agreement with Horizon Power in respect to a future Power Purchase Agreement was executed in April 2022. The agreement will allow for cleaner and cheaper energy to be delivered to the Sorby Hills Project. The Ord River hydroelectric plant will provide the majority of the energy demand with an on-site diesel plant to provide 100% back-up power. [To find out more read here](https://boabmetals.com/wp-content/uploads/2023/05/Cleaner-and-Cheaper-Power-for-Sorby-Hills.pdf) - **MAR 2022 – Port Access Agreement Executed** An agreement for Access and Stevedoring Services was executed with Cambridge Gulf with respect to the Wyndham Port. The term extends to 2034 with an automatic rollover on a 12 month basis thereafter. The agreement is a critical element of the path to market for the concentrates that will be produced at Sorby Hills and shipped to customers. [To find out more read here](https://boabmetals.com/wp-content/uploads/2023/01/20220331_Boab-Secures-Port-Access-Agreement.pdf) - **DEC 2021 – Expanded Resource to Underpin Sorby Hills DFS** Boab Metals announces a Mineral Resource update that incorporates the results of the Phase IV and Phase V drilling programs. The updated Mineral Resource Estimate represents a significant milestone in the development of the Sorby Hills Lead-Silver Project. [Read the full Mineral Resource Update here.](https://boabmetals.com/wp-content/uploads/2023/05/20211217-2319170-Expanded-Resource-to-Underpin-DFS.pdf) - **NOV 2021 – DFS Metallurgical Testwork Results** Boab Metals presents the comprehensive results of the DFS Metallurgical Testwork Program undertaken on the Sorby Hills Lead-Silver-Zinc Project. The recovery uplift resulting from separated ore versus blended ore processing is encouraging and will have a positive impact on the Project economics. [Read the full DFS Metallurgical Testwork Results here.](https://boabmetals.com/wp-content/uploads/2023/05/20211119-2303039-DFS-Met-Testwork-results.pdf) - **JUL 2021 – Strategic Acquisition of Zinc-Silver-Lead Project** Boab Metals announced the acquisition of the strategically located Manbarrum-Zinc-Lead-Silver Project located in the Northern Territory, located 25km east of the Company’s flagship Sorby Hills Lead-Silver-Zinc Project. Mineral Resources are declared at two prospects within the Manbarrum Project Area. [Read the full Manbarrum acquisition announcement here.](https://boabmetals.com/wp-content/uploads/2023/05/20210721-2237412-Strategic-Acquistion-of-Zinc-Silver-Lead-Project.pdf) - ** [Excerpt trimmed for readability. Open the original source for the complete filing or document.]